feat: support mvcgen' inside sym => … blocks#13680
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This PR registers `mvcgen'` as a step in the `grind` syntax category, so it can be used inside `sym => …` blocks. Each leftover VC becomes a fresh `Grind.Goal` built in the surrounding block's `Grind.GrindM`, with its local hypotheses internalized (`processHypotheses`) and the block's user-supplied e-match theorems activated (`assertExtra`), so subsequent grind steps see them without explicit `internalize_all` or having to re-pass the lemmas. Spec lookup (`mkBackwardRuleFromSpec`) wraps its three triple-defeq checks in `Meta.withDefault`. The ambient grind transparency is `reducible` (set by `Grind.withGTransparency` because `Grind.Config.reducible := true`), under which instance projections like `WPMonad.toWP` don't unfold and so don't compare equal to a direct `WP` instance. Standalone `mvcgen'` happens to inherit default transparency from `MetaM`, so the issue only surfaces when called from inside an outer `Grind.GrindM`. `Driver.runFromGoal` is renamed to `Driver.run`; callers seed the `Grind.Goal` themselves (via `Grind.mkGoalCore` from `TacticM`, or `getMainGoal` from `Grind.GrindTacticM`).
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This PR registers
mvcgen'as a step in thegrindsyntax category, so it can be used insidesym => …blocks. Leftover VCs become fresh subgoals for subsequent grind steps.The
: grinddeclaration mirrors the existing: tacticsurface; the builtin grind handler re-tags the syntax kind and dispatches to the regularelabMVCGen', then wraps the leftover MVarIds as freshGrind.Goals viamkGoalCore.